Problems & Solutions for Drilling Fluid Circulation System Sand Pumps

As the power source for drilling fluid solid control equipment (desanders, desilters, etc.), sand pumps also serve as charging/transfer pumps. Key installation and operation guidelines to avoid issues:

Unlike positive displacement pumps, sand pumps maintain constant head at fixed flow, unaffected by fluid density. For correct (model, speed, impeller diameter, motor), predetermine external load, design pipelines by required flow (not flange specs), and calculate head—prioritize lower speeds to reduce wear, or consult professionals.

Critical precautions: Use independent suction lines (no common/parallel setups); install and clean inlet strainers regularly to prevent gas entry. Never alter impellers without professional approval, throttle inlet valves (causes cavitation), or use discharge bypass valves (wastes power)—adjust flow by closing cyclones instead.

For startup: Close discharge valves (run ≤1-2 minutes to avoid fluid boiling), then open gradually until stable. Ensure motor power matches max flow/density demands; keep packing gland leakage at 2-4 drops/min. Lubricate bearings per manual (2-4 annual oil changes for oil-lubricated types).